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run code in 300+ PHP versions simultaneously
<?php /** * @link http://stackoverflow.com/q/24526493/367456 */ $xml = <<<XML <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE xxe [<!ENTITY foo "aaaaaa">]> <article/> XML; libxml_set_external_entity_loader(function() { var_dump(func_get_args()); return NULL; }); $doc = new DOMDocument; $doc->loadXML($xml, LIBXML_DTDLOAD); echo "----\n"; libxml_set_external_entity_loader(NULL); $doc = new DOMDocument; $doc->loadXML($xml, LIBXML_DTDLOAD);

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